PWM output of 40khz and more

Started by holopoint.rm August 7, 2003
Good morning everyone.
Me again. And another discussion.
I'm planning on driving two pittman motors with an H-Bridge.
These are good motors with low inductance so i will be needing
a PWM around 40khz or even 60khz if possible.
The question is, how to produce variable width PWM at 40khz or more ?
Can the 18f452 handle it ?
Is there a way to slave this task to a PWM IC of some sort ?

What do you think ?

PS. Anyone know a good tutorial about driving DC
motors, Locked-antiphase, Sign-Magnitude and such ?

Thanks,
Shachar Weis.



--- In , "holopoint.rm" <holopoint@r...>
wrote:
> Good morning everyone.
> Me again. And another discussion.
> I'm planning on driving two pittman motors with an H-Bridge.
> These are good motors with low inductance so i will be needing
> a PWM around 40khz or even 60khz if possible.
> The question is, how to produce variable width PWM at 40khz or
more ?
> Can the 18f452 handle it ?
> Is there a way to slave this task to a PWM IC of some sort ?
>
> What do you think ?
>
> PS. Anyone know a good tutorial about driving DC
> motors, Locked-antiphase, Sign-Magnitude and such ?
>
> Thanks,
> Shachar Weis.

You could start here
http://www.barello.net/Papers/Motion_Control/index.htm

then post your questions here

http://groups.yahoo.com/group/SeattleRobotics/?yguidp667039

http://groups.yahoo.com/group/theroboticsclub/?yguidp667039

http://groups.yahoo.com/group/PARTS/?yguidp667039

There have been many recent discussions about this in the 3 groups,
might search the archives for answers before posting any questions.

Mike



On Thursday 07 Aug 2003 8:43 am, holopoint.rm wrote:
> Good morning everyone.
> Me again. And another discussion.
> I'm planning on driving two pittman motors with an H-Bridge.
> These are good motors with low inductance so i will be needing
> a PWM around 40khz or even 60khz if possible.
> The question is, how to produce variable width PWM at 40khz or more ?

Maybe I am missing something but isn't PWM frequency more related to the
mechanical time constant of the motor than its inductance?

Ian